package com.lzx.iteam.json;



import java.io.IOException;
import java.io.Writer;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;


/**
 * A JSON array. JSONObject supports java.util.List interface.
 *
 * @author FangYidong<fangyidong@yahoo.com.cn>
 */
public class JSONArray extends ArrayList implements List, JSONAware, JSONStreamAware {
    private static final long serialVersionUID = 3957988303675231981L;

    /**
     * Encode a list into JSON text and write it to out.
     * If this list is also a JSONStreamAware or a JSONAware, JSONStreamAware and JSONAware specific behaviours will be ignored at this top level.
     *
     * @see org.json.simple.JSONValue#writeJSONString(Object, Writer)
     *
     * @param list
     * @param out
     */
    public static void writeJSONString(List list, Writer out) throws IOException{
        if(list == null){
            out.write("null");
            return;
        }

        boolean first = true;
        Iterator iter=list.iterator();

        out.write('[');
        while(iter.hasNext()){
            if(first)
                first = false;
            else
                out.write(',');

            Object value=iter.next();
            if(value == null){
                out.write("null");
                continue;
            }

            JSONValue.writeJSONString(value, out);
        }
        out.write(']');
    }

    public void writeJSONString(Writer out) throws IOException{
        writeJSONString(this, out);
    }

    /**
     * Convert a list to JSON text. The result is a JSON array.
     * If this list is also a JSONAware, JSONAware specific behaviours will be omitted at this top level.
     *
     * @see org.json.simple.JSONValue#toJSONString(Object)
     *
     * @param list
     * @return JSON text, or "null" if list is null.
     */
    public static String toJSONString(List list){
        if(list == null)
            return "null";

        boolean first = true;
        StringBuffer sb = new StringBuffer();
        Iterator iter=list.iterator();

        sb.append('[');
        while(iter.hasNext()){
            if(first)
                first = false;
            else
                sb.append(',');

            Object value=iter.next();
            if(value == null){
                sb.append("null");
                continue;
            }
            sb.append(JSONValue.toJSONString(value));
        }
        sb.append(']');
        return sb.toString();
    }

    public String toJSONString(){
        return toJSONString(this);
    }

    public String toString() {
        return toJSONString();
    }

}